Tool-holder for lathes



(No Model.)

J. A. ROTHWELL.

TOOL HOLDBB [FOR LATHES'. No. 545,314. Patented Aug. 27,1895.

INVENTOR UNITED STATES PATENT OFFICE.

JOSEPH A. ROTHWELL, or BROOKLYN, NEW YORK.

TOOL-HOLDER Fol; LATHES.

SPECIFICATION forming part of Letters Patent No. 545,314, dated August 27, 1895.

Application filed May 13, 1895.

To all whom, it may c0ncern2"' Be it known that I, JOSEPH A. ROTHWELL, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented a new and useful Tool-Holder for Lathes, of which the following is a specification.

My invent-ion relates to improvements in tool-holders for lathes in which a loose collar operates in conjunction with a shoe and post; and the objects of my invention are, first, to provide a tool-holder which may be readily and accurately adjusted; second, to avoid the dangerof slipping, as in ordinary tool-holders; and, third, to provide a tool-holder from which the tool may be removed for the purpose of grinding and be replaced without the usual delay 1n resetting. I attain these objects by the mechanism illustrated in the accompanying drawings, in Which- Figure 1 is a perspective view of the entire tool-holder. Fig. 2 is a section of the collar B. Fig. 3 1s a top view of the collar B, and Fig.4 a perspective viewof the shoe A.

Similar letters refer to similar partsthroughv out the several views.

lhe collar B is provided with a spherical spiral on its upper surface, as shown in Figs. and 8. The shoe Ais provided with proections on a portion of its spherical surface to correspond with the spiral on the collar B,

Serial No. 549,203. (N0 M1.)

and is held in position hy the slot in the post D and resting in any desired position on the collar B. It will be understood that the rotary movement of the collar B on the post D will move the shoe A by the action of the spiral on the projections of the shoe A, and so change the plane of the upper surface of the shoe A that the cutting-edge of the tool E may be elevated .or lowered at the desire of the operator. The projections on the shoeA engaging in the spiral of the collar B also avoids the possibility of its moving while the tool is cutting, and thereby removes the danger of destroying the work. It will alsobe understood that the tool E may be removed for the purpose of grinding and replaced without the delay occasioned by resetting, as in ordinary Ltool-holders, the shoe A having no tendency to change its position during the operation.

I claim as my invention-- The combination of the collar B, provided with a spherical spiral, the shoe A, provided withprojections to engage in the spiral of the collar B, and the ordinary post D, to con- I stitute a tool-holder substantially as set forth in the foregoing specification.

JOSEPH A., ROTHWELL.

- Witnesses:

THOS. LoETHoUsE, ARTHUR W. ALLDRIDGE. 

